User blog comment:SunsetKitten/The Boring Blog (8th Gym?)/@comment-32391784-20170826112732

I don't think Tess can get to Crescent Isle as none of her Pokémon have surf and she hasn't been any gyms so can't use it anyway, but that's a technicality and would also mean she couldn't have passed route 14 so I'll let that one slide.

Anyway, this is probably one of the more interesting theories I've seen for the 8th gym. Plus I think the next lost islands update will include Tess's parents. I hope this is true as it is pretty interesting, but Cypress only used starters.